The idea here is to have a different (randomly generated) map every day.It could improve retention by giving players a reason to come back the next day. It would offer a fix challenge for everyone during 24h, the opportunity to express a particular strategy and then renew it after that.Thoughts?

"Map of The Day" sounds interesting, but I'm not sure if beginners will like this idea. Look at all the multiplayer first person shooters, they have a set of well known maps and it works perfectly. I think you should keep known set of maps and treat Map of The Day as a bonus or (exclusively) switch to totally random maps that change in every match.

I like the idea of a turnover system. A new map everyday, and one drops off the roster, I think a map should last at most 1 week, and random selection between the current maps on the roster. Like maybe keep a map 7 days, then drop it off, and keep like 3 maps always from maybe the current maps (maybe some with more than 4 bots, just for a change), so there is always 10 maps in the selection. Just an idea.